Fuse Box Diagrams GMC Sierra (GMT800; 1999-2002)

In this article, you will find information about the fuses of the GMC Sierra (GMT800) (1999, 2000, 2001, and 2002), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.

GMC Sierra GMT800 (1999-2002)

Checking and Replacing Fuses in GMC Sierra

The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links. This greatly reduces the chance of fires caused by electrical problems. Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. If you ever have a problem on the road and don’t have a spare fuse, you can borrow one that has the same amperage.

  • You can remove fuses with a fuse extractor.
  • The fuse extractor is mounted to the fuse block access door.

Caution!

  • Don’t add anything electrical to your vehicle unless you check with your dealer first.
  • Some add-on electrical equipment can keep other components from working as they should.
  • Be sure you replace a bad fuse with a new one of the identical size and rating.

Location of Fuse Boxes

Instrument Panel Fuse Block:
The fuse block access door is on the driver’s side edge of the instrument panel. Pull off the cover to access the fuse block.

GMC Sierra GMT800 (1999-2002): Instrument panel fuse box location

Center Instrument Panel Utility Block:
The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Underhood Electrical Center:
The underhood electrical center is located on the driver’s side of the engine compartment near the battery. Lift the cover for access to the fuse/relay block.
GMC Sierra GMT800 (1999-2002): Engine compartment fuse box location

 

The windshield wiper motor is protected by an internal circuit breaker and a fuse. If the motor overheats due to heavy snow, etc., the wiper will stop until the motor cools.


Fuse Box Diagrams

1999

Instrument Panel Fuse Block

GMC Sierra GMT800 (1999): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (1999)
NAMEUsage
L BODYRetained Accessory Power Relay
LOCKPower Door Locks
DRV UNLOCKPower Door Lock Relay
LOCKPower Door Lock Relay
HVAC 1Climate Control System
CRUISECruise Control, Instrument Cluster
IGN 3Ignition, Power Seats
4WDFour-Wheel Drive System, Auxiliary Battery
CRANKStarting System
INT PRKParking Lamps, Sidemarker Lamps, Interior Lamps
L DOORPower Door Lock Relay
BRAKEAnti-Lock Brake System
RR WIPERNot Used
ILLUMInterior Lamps
SEATPower Seat Circuit Breaker
TURNExterior Lamps, Turn Signals, Hazard Lamps
UNLOCKPower Door Locks
HTR A/CClimate Control System
WS WPRWindshield Wipers
IGN 1Ignition, Instrument Panel
AIR BAGAir Bag
MIR/LOCKPower Mirrors, Power Door Locks
DR LOCKPower Door Locks
PWR WDOPower Window Circuit Breaker
UNLOCKPower Door Lock Relay
IGN 0PRND321 Display, Odometer, VCM/PCM
SEO IGNSpecial Equipment Option, Ignition, Manual Selectable Ride
SEO ACCYSpecial Equipment Option Accessory, Cellular Telephone
RAP #1Retained Accessory Power Relay
RDO 1Audio System
RAP #2Not Used
Center Instrument Panel Utility Block

GMC Sierra GMT800 (1999): Instrument panel fuse box diagram

List of fuses in the Center Instrument Panel Utility Block (1999)
Relay NameUsage
SEOSpecial Equipment Option
HTD STHeated Scats
SPARE 4Not Used
VANITYHeadliner Wiring
TRAILERTrailer Brake Wiring
PWR STPower Seats
SPARE 5Not Used
CLUTCHManual Transmission Clutch Switch
UPFUpfittcr
PARK LAMPParking Lamps
FRT PRK EXPTNot Used
SL RIDEManual Selectable Ride Switch
SPARE 2Not Used
RR PRK LPNot Used
RR FOG LPNot Used
SPARE 3Not Used
INAV PWRInterior Lights Feed
CTSY LPCourtesy Lamps
CEL PHONECellular Telephone Wiring
Underhood Electrical Center

GMC Sierra GMT800 (1999): Engine compartment fuse box diagram

List of fuses in the Underhood Electrical Center (1999)
NameUsage
STUD #1Accessory Power / Trailer Wiring Feed
ABSAnti-Lock Brakes
IGN AIgnition Switch
AIRA.I.R. System
RAP #1Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGN BIgnition Switch
RAP #2Not Used
STUD #2Accessory Power / Trailer Wiring Brake Feed
TRL R TRNRight Turn Signal Trailer Wiring
TRL L TRNLeft Turn Signal Trailer Wiring
IGN 1Ignition, Fuel Controls
INJ BIgnition, Fuel Controls (Relay)
STARTERStarter (Relay)
PARK LPParking Lamps
FRT HVACClimate Control System
STOP LPExterior Lamps, Stoplamps
ECM 1VCM/PCM
CHMSLCenter High Mounted Stoplamp
VEH STOPStoplamps, Cruise Control
TRL B/UBackup Lamps Trailer Wiring
INJ AFuel Controls, Ignition
RR HVACNot Used
VEH B/UVehicle Backup Lamps
ENG 1Engine Controls, Canister Purge, Fuel System
ETCElectronic Throttle Control
IGN EA/C Compressor Relay, Rear Window Dcfogger, Daytime Running Lamps, A.I.R. System
B/U LPBackup Lamps, BTSI
ATCAutomatic Transfer Case
RR DEFOGRear Window Dcfogger, Heated Mirrors (Relay)
RR PRKRight Rear Parking Lamps
ECM BVCM/PCM
F/PMPFuel Pump (Relay)
O2 AOxygen Sensors
O2 BOxygen Sensors
LR PRKLeft Rear Parking Lamps
RR DEFOGRear Window Dcfogger, Heated Mirrors
HDLPHeadlamps (Relay)
TRL PRKParking Lamps Trailer Wiring
RT HDLPRight Headlamps
DRLDaytime Running Lamps (Relay)
HTD MIRHeated Mirrors
LT HDLPLeft Headlamps
A/CAir Conditioning
AUX PWRCigarette Lighter, Auxiliary Power Outlets
SEO 2Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone
DRLDaytime Running Lamps
A/CA/C (Relay)
FOG LPFog Lamps
FOG LPFog Lamps (Relay)
RADIOAudio System, Instrument Cluster, Climate Control System
CIGARCigarette Lighter, Auxiliary Power Outlets
RT TURNRight Turn Signals
BTSIBrake-Transmission Shift Interlock
LT TURNLeft Turn Signals
FR PRKFront Parking Lamps, Sidcmarker Lamps
W/W PMPWindshield Washer Pump
HORNHorn (Relay)
IGN CIgnition Switch, Fuel Pump, PRND321 Display, Crank
RDO AMPNot Used
HAZ LPExterior Lamps, Hazard Lamps
EXP LPSNot Used
HORNHorn
CTSY LPInterior Lamps
RR WPRNot Used
TBCBody Control Module, Remote Keyless Entry, Headlamps

2000

Instrument Panel Fuse Block

GMC Sierra GMT800 (2000): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2000)
NAMEUsage
L BODYRetained Accessory Power Relay
LOCKPower Door Locks
DRV UNLOCKPower Door Lock Relay
LOCKPower Door Lock Relay
HVAC 1Climate Control System
CRUISECruise Control, Instrument Cluster
IGN 3Ignition, Power Seats
4WDFour-Wheel Drive System, Auxiliary Battery
CRANKStarting System
INT PRKParking Lamps, Sidemarker Lamps, Interior Lamps
L DOORPower Door Lock Relay
BRAKEAnti-Lock Brake System
RR WIPERNot Used
ILLUMInterior Lamps
SEATPower Seat Circuit Breaker
TURNExterior Lamps, Turn Signals, Hazard Lamps
UNLOCKPower Door Locks
HTR A/CClimate Control System
WS WPRWindshield Wipers
IGN 1Ignition, Instrument Panel
AIR BAGAir Bag
MIR/LOCKPower Mirrors, Power Door Locks
DR LOCKPower Door Locks
PWR WDOPower Window Circuit Breaker
UNLOCKPower Door Lock Relay
IGN 0PRND321 Display, Odometer, VCM/PCM
SEO IGNSpecial Equipment Option, Ignition, Manual Selectable Ride
SEO ACCYSpecial Equipment Option Accessory, Cellular Telephone
RAP #1Retained Accessory Power Relay
RDO 1Audio System
RAP #2Not Used
Center Instrument Panel Utility Block

GMC Sierra GMT800 (2000): Instrument panel fuse box diagram

List of fuses in the Center Instrument Panel Utility Block (2000)
Relay NameUsage
SEOSpecial Equipment Option
HTD STHeated Seats
SPARE 4Not Used
VANITYHeadliner Wiring
TRAILERTrailer Brake Wiring
PWR STPower Seats
SPARE 5Not Used
CLUTCHManual Transmission Clutch Switch
UPFUpfitter
PARK LAMPParking Lamps
FRT PRK EXPTNot Used
SL RIDEManual Selectable Ride Switch
SPARE 2Not Used
RR PRK LPNot Used
RR FOG LPNot Used
SPARE 3Not Used
INAV PWRInterior Lights Feed
CTSY LPCourtesy Lamps
CEL PHONECellular Telephone Wiring
Underhood Electrical Center

GMC Sierra GMT800 (2000): Engine compartment fuse box diagram

List of fuses in the Underhood Electrical Center (2000)
NameUsage
STUD #1Accessory Power / Trailer Wiring Feed
ABSAnti-Lock Brakes
IGN AIgnition Switch
AIRA.I.R. System
RAP #1Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGN BIgnition Switch
RAP #2Not Used
STUD #2Accessory Power / Trailer Wiring Brake Feed
TRL R TRNRight Turn Signal Trailer Wiring
TRL L TRNLeft Turn Signal Trailer Wiring
IGN 1Ignition, Fuel Controls
INJ BIgnition, Fuel Controls (Relay)
STARTERStarter (Relay)
PARK LPParking Lamps
FRT HVACClimate Control System
STOP LPExterior Lamps, Stoplamps
ECM 1VCM/PCM
CHMSLCenter High Mounted Stoplamp
VEH STOPStoplamps, Cruise Control
TRL B/UBackup Lamps Trailer Wiring
INJ AFuel Controls, Ignition
RR HVACNot Used
VEH B/UVehicle Backup Lamps
ENG 1Engine Controls, Canister Purge, Fuel System
ETCElectronic Throttle Control
IGN EAJC Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System
B/U LPBackup Lamps, Automatic Transmission Shift Lock Control System
ATCAutomatic Transfer Case
RR DEFOGRear Window Defogger, Heated Mirrors (Relay)
RR PRKRight Rear Parking Lamps
ECMBVCM/PCM
F/PMPFuel Pump (Relay)
O2 AOxygen Sensors
O2 BOxygen Sensors
LR PRKLeft Rear Parking Lamps
RR DEFOGRear Window Defogger, Heated Mirrors
HDLPHeadlamps (Relay)
TRL PRKParking Lamps Trailer Wiring
RT HDLPRight Headlamps
DRLDaytime Running Lamps (Relay)
HTD MIRHeated Mirrors
LT HDLPLeft Headlamps
A/CAir Conditioning
AUX PWRCigarette Lighter, Auxiliary Power Outlets
SEO 2Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone
DRLDaytime Running Lamps
A/CA/C (Relay)
FOG LPFog Lamps
FOG LPFog Lamps (Relay)
RADIOAudio System, Instrument Cluster, Climate Control System
CIGARCigarette Lighter, Auxiliary Power Outlets
RT TURNRight Turn Signals
BTSIAutomatic Transmission Shift, Lock Control System
LT TURNLeft Turn Signals
FR PRKFront Parking Lamps, Sidemarker Lamps
W/W PMPWindshield Washer Pump
HORNHorn (Relay)
IGN CIgnition Switch, Fuel Pump, PRND321 Display, Crank
RDO AMPNot Used
HAZ LPExterior Lamps, Hazard Lamps
EXP LPSNot Used
HornHorn
CTSY LPInterior Lamps
RR WPRNot Used
TBCBody Control Module, Remote Keyless Entry, Headlamps

2001

Instrument Panel Fuse Block

GMC Sierra GMT800 (2001): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2001)
NAME Usage
L BODY Retained Accessory Power Relay
LOCKPower Door Locks
DRV UNLOCKPower Door Lock Relay
LOCKPower Door Lock Relay
HVAC 1Climate Control System
CRUISECruise Control, Instrument Panel Cluster
IGN 3Ignition, Power Seats
4WDFour-Wheel Drive System, Auxiliary Battery
CRANKStarting System
INT PRKParking Lamps, Sidemarker Lamps, Interior Lamps
L DOORPower Door Lock Relay
BRAKEAnti-Lock Brake System
RR WIPERNot Used
ILLUMInterior Lamps
SEATPower Seat Circuit Breaker
TURNExterior Lamps, Turn Signals, Hazard Lamps
UNLOCKPower Door Locks
HTRA/CClimate Control System
WS WPRWindshield Wipers
IGN 1Ignition, Instrument Panel
AIR BAGAir Bag
MIR/LOCKPower Mirrors, Power Door Locks
DR LOCKPower Door Locks
PWR WDOPower Window Circuit Breaker
UNLOCKPower Door Lock Relay
IGN 0PRND321 Display, Odometer, PCM
SEO IGNSpecial Equipment Option, Ignition, Manual Selectable Ride
SEO ACCYSpecial Equipment Option Accessory, Cellular Telephone
RAP #1Retained Accessory Power Relay
RDO 1Audio System
RAP #2Not Used
Center Instrument Panel Utility Block

GMC Sierra GMT800 (2001): Instrument panel fuse box diagram

List of fuses in the Center Instrument Panel Utility Block (2001)
NameUsage
SEOSpecial Equipment Option
HTD STHeated Seats
SPARE 4Not Used
VANITYHeadliner Wiring
TRAILERTrailer Brake Wiring
PWR STPower Seats
SPARE 5Not Used
CLUTCHManual Transmission Clutch Switch
UPFUpfitter
PARK LAMPParking Lamps (Relay)
FRT PRK EXPTNot Used (Fuse)
SL RIDEManual Selectable Ride Switch
SPARE 2Not Used
RR PRK LPNot Used (Relay)
RR FOG LPNot Used (Relay)
SPARE 3Not Used
INADV PWRInterior Lights Feed
CTSY LPCourtesy Lamps
CEL PHONECellular Telephone Wiring
Underhood Electrical Center

GMC Sierra GMT800 (2001): Engine compartment fuse box diagram

List of fuses in the Underhood Electrical Center (2001)
NameUsage
GLOW PLUGDiesel Glow Plugs and Intake Air Heater
CUST FEEDGasoline Accessory Power
STUD #1Accessory Power / Trailer Wiring Feed
ABSAnti-Lock Brakes
IGN AIgnition Switch
AIRA.I.R. System
RAP #1Power Mirrors, Power Door Locks, Power Seat(s)
IGN BIgnition Switch
RAP #2Not Used
STUD #2Accessory Power / Trailer Wiring Brake Feed
SPARESpare Fuse
TRL R TRNRight Turn Signal Trailer Wiring
TRL L TRNLeft Turn Signal Trailer Wiring
IGN 1Ignition, Fuel Controls (Relay)
INJ BIgnition, Fuel Controls
STARTERStarter (Relay)
PARK LPParking Lamps
FRT HVACClimate Control System
STOP LPExterior Lamps, Stoplamps
ECM IPCM
ECMRPVFuel Controls, ECM
CHMSLCenter High Mounted Stoplamp
VEH STOPStoplamps, Cruise Control
TRL B/UBackup Lamps Trailer Wiring
INJ AFuel Controls, Ignition
RR HVACNot Used
VEH B/UVehicle Backup Lamps
ENG 1Engine Controls, Canister Purge, Fuel System
ETCElectronic Throttle Control
IGN EA/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System
B/U LPBackup Lamps, Automatic Transmission Shift Lock Control System
ATCAutomatic Transfer Case
RR DEFOGRear Window Defogger, Heated Mirrors (Relay)
RR PRKRight Rear Parking Lamps
ECMBPCM
F/PMPFuel Pump (Relay)
O2 AOxygen Sensors
FUEL HTFuel Heater, Glow Plug and Intake Heater Controls
O2 BOxygen Sensors
LR PRKLeft Rear Parking Lamps
RR DEFOGRear Window Defogger, Heated Mirrors
HDLPHeadlamps (Relay)
TRLPRKParking Lamps Trailer Wiring
RT HDLPRight Headlamps
DRLDaytime Running Lamps (Relay)
HTD MIRHeated Mirrors
LT HDLPLeft Headlamps
A/CAir Conditioning
AUX PWRCigarette Lighter, Auxiliary Power Outlets
SEO 2Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone, OnStar
DRLDaytime Running Lamps
A/CA/C (Relay)
FOG LPFog Lamps
FOG LPFog Lamps (Relay)
RADIOAudio System, Instrument Cluster, Climate Control System
*1 INJ B-Gasoline Engine and Diesel Engine.
*2 ECM I-Gasoline Engine; ECMRPV-Diesel Engine.
*3 O2 A-Gasoline Engine; FUEL HT-Diesel Engine.
*4 O2 B-Gasoline Engine; ECM I-Diesel Engine.

2002

Instrument Panel Fuse Block

GMC Sierra GMT800 (2002): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2002)
FuseUsage
L BODYRetained Accessory Power Relay
LOCKPower Door Locks
DRV UNLOCKPower Door Lock Relay
LOCKPower Door Lock Relay
HVAC 1Climate Control System
CRUISECruise Control, Instrument Panel Cluster
IGN 3Ignition, Power Seats
4WDNot Used
CRANKStarting System
INT PRKInterior Lamps
L DOORPower Door Lock Relay
BRAKEAnti-Lock Brake System
RR WIPERNot Used
ILLUMInterior Lamps
SEATPower Seat Circuit Breaker
TURNExterior Lamps, Turn Signals, Hazard Lamps
UNLOCKPower Door Locks
HTR A/CClimate Control System
WS WPRWindshield Wipers
IGN 1 Ignition, Instrument Panel
AIR BAGAir Bag
MIR/LOCKPower Mirrors, Power Door Locks
DR LOCKPower Door Locks
PWR WDOPower Window Circuit Breaker
UNLOCKPower Door Lock Relay
IGN 0PRND321 Display, Odometer, PCM
SEO IGNSpecial Equipment Option, Ignition, Manual Selectable Ride
SEO ACCYSpecial Equipment Option Accessory, Cellular Telephone
RAP #1Retained Accessory Power Relay
RDO 1Audio System
RAP #2Not Used
Center Instrument Panel Utility Block

GMC Sierra GMT800 (2002): Instrument panel fuse box diagram

List of fuses in the Center Instrument Panel Utility Block (2002)
Fuse NameUsage
SEOSpecial Equipment Option
HTD STHeated Seats
SPARENot Used
VANITYHeadliner Wiring
TRAILERTrailer Brake Wiring
PWR STPower Seats
SPARENot Used
UPFUpfitter
PARK LAMPParking Lamps
FRTPRK EXPT*Not Used
SPARE 2Not Used
PUDDLE LPPuddle Lamps
SL RIDENot Used
SPARE 3Not Used
INADV PWRInterior Lamps Feed
CTSY LPCourtesy Lamps
CEL PHONECellular Telephone Wiring
Underhood Electrical Center

GMC Sierra GMT800 (2002): Engine compartment fuse box diagram

List of fuses in the Underhood Electrical Center (2002)
FuseUsage
STUD #1Accessory Power / Trailer Wiring Feed / Load Leveling
ABSAnti-Lock Brakes
IGN AIgnition Switch
AIRA.I.R. System
RAP #1Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGN BIgnition Switch
RAP #2Retained Accessory Power / Rear Power Windows, Sunroof, Radio
STUD #2Accessory Power / Trailer Wiring Brake Feed
TRL R TRNRight Turn Signal Trailer Wiring
TRL L TRNLeft Turn Signal Trailer Wiring
IGN 1Ignition, Fuel Controls
INJ BIgnition, Fuel Controls (Relay)
STARTERStarter (Relay)
PARK LPParking Lamps
FRT HVACClimate Control System
STOP LPExterior Lamps, Stoplamps
ECM 1VCM/PCM
CHMSLCenter High Mounted Stoplamp
VEH STOPStoplamps, Cruise Control
TRL B/UBackup Lamps Trailer Wiring
INJ AFuel Controls, Ignition
RRHVACRear HVAC
VEH B/UVehicle Backup Lamps
ENG 1Engine Controls, Canister Purge, Fuel System
ETCElectronic Throttle Control
IGN EA/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System
B/U LPBackup Lamps, Automatic Transmission Shift Lock Control System
ATCAutomatic Transfer Case
RR DEFOGRear Window Defogger, Heated Mirrors (Relay)
RTDNot Used
RRPRKPassenger’s Side Parking Lamps
ECMBVCM/PCM
F/PMPFuel Pump (Relay)
O2 AOxygen Sensors
O2 BOxygen Sensors
LR PRKDriver’s Side Parking Lamps
RR DEFOGRear Window Defogger, Heated Mirrors
HDLPHeadlamps (Relay)
TRL PRKParking Lamps Trailer Wiring
PRIMENot Used
RT HDLPPassenger’s Side Headlamps
DRLDaytime Running Lamps (Relay)
HTD MIRHeated Mirrors
LT HDLPDriver’s Side Headlamps
A/CAir Conditioning
AUX PWRCigarette Lighter, Auxiliary Power Outlets
SEO 2Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1Special Equipment Option Power, Aux Roof Mnt Lamp
DRLDaytime Running Lamps
A/CA/C (Relay)
FOG LPFog Lamps
FOG LPFog Lamps (Relay)
RADIOAudio System, Instrument Panel Cluster, Climate Control System